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Warrants for Convertible Preferred Stock | 9 Months Ended
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Sep. 30, 2020
Warrants And Rights Note Disclosure [Abstract] |
Warrants for Convertible Preferred Stock | Note 11 – Warrants for Convertible Preferred Stock The Company has issued warrants to purchase shares of preferred stock in conjunction with the sale of certain preferred shares and certain debt issuances. The grant date fair value and fair value at each reporting date of the warrants was determined using the Black‑Scholes option pricing model with weighted average assumptions relatively consistent with those disclosed for stock options above, other than term, which is the contractual term of the warrant and the use of the exercise price and current estimated fair value of the respective series of preferred stock. The preferred warrants are classified as liabilities on the accompanying balance sheets as the underlying preferred stock has a contingent redemption feature. As these warrants are classified as a liability, they are revalued on each reporting date or exercise date, and any change in value is recorded to change in fair value of the warrant liability in the accompanying statements of operations. The following table presents the activity for convertible preferred stock warrants outstanding (in thousands, except weighted average exercise price):
|  | Series E |  |  | Series G |
|  | Warrants |  |  | Weighted Average Exercise price |  |  | Warrants |  |  | Weighted Average Exercise price |
Outstanding ‑ December 31, 2019 |  |  | 925 |  |  | $ | 5.00 |  |  |  | 613 |  |  | $ | 0.75 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited/canceled |  |  | (925 | ) |  |  | (5.00 | ) |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding ‑ September 30, 2020 |  |  | — |  |  | $ | — |  |  |  | 613 |  |  | $ | 0.75 |
Weighted average remaining contractual life at September 30, 2020 |  |  |  |  |  |  |  |  |  | 7.5 years |

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